A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

A pressure control device has at least two switching valves (10, 12), a feedback control unit (14), a sensor unit (20), and a voltage supply unit (24), and continuously adjusts hydraulic systems.

A well annular pressure control device includes a housing having a through bore and at least two iris valves within the housing. The iris valves comprise a plurality of vanes operable between an open position and a closed position to define an opening. At least one actuator is coupled to the plurality of vanes to move the plurality of vanes between the open position and the closed position.

In some examples, a cabin pressure control and monitoring system includes an outflow valve and a manual control panel comprising a selector switch and configured to generate a signal, wherein a value encoded in the signal is dependent on a position of the selector switch. The cabin pressure control and monitoring system also includes a controller configured to receive the signal from the manual control panel, determine a target rate of change for a cabin pressure based on the value encoded in the signal, and control the outflow valve based on the target rate of change.

A fluid pressure reducing valve apparatus includes a pressure reducing valve. The valve has: a body containing a fluid-flow chamber, a liquid supply orifice into the chamber, a liquid outlet from the chamber, a regulation plate opposed to the orifice, a spring acting to urge the plate towards the orifice, and a diaphragm between the plate and the body to close the chamber between them. A controllable motor drive acts between the body and an end of the spring remote from the plate. A flow meter is positioned downstream of the outlet. A controller is arranged to receive flow data from the flow meter and to control the motor drive for withdrawal of the remote end of the spring in accordance with flow rate measured by the flow meter. For an increase in demand flow, the plate is partially withdrawn to maintain downstream pressure on such increase and vice versa.

Disclosed is an apparatus for relieving pressure in a fluid transportation system. Further, the apparatus may include an actuator configured to be mounted onto the handle of the flow control member. Further, the apparatus may include a valve sensor configured to be attached to a pressure relieving valve. Further, the apparatus may include an image capturing device configured to capture an image of a pressure gauge. Further, the apparatus may include a processing device communicatively coupled to the actuator, the valve sensor and the image capturing device. Further, the apparatus may include a storage device communicatively coupled to the processing device. Further, the apparatus may include a wireless transceiver communicatively coupled to the processing device. Further, the apparatus may include a touchscreen display device communicatively coupled to the processing device.

A well annular pressure control device includes a housing having a through bore and at least two iris valves within the housing. The iris valves comprise a plurality of vanes operable between an open position and a closed position to define an opening. At least one actuator is coupled to the plurality of vanes to move the plurality of vanes between the open position and the closed position.

An estimator comprises: an acquisitor to acquire a plurality of data pairs each containing a valve body opening of the vacuum valve and the chamber pressure at the valve body opening; and an operator to operate the gas species characteristic value and the first chamber volume estimation value, based on an exhaust's expression representing a relationship among the second effective exhaust rate, a flow rate of a gas introduced into the vacuum chamber, a chamber volume, and a chamber pressure, the plurality of data pairs acquired in the acquisitor, and correlation data between the valve body opening and the second effective exhaust rate about the predetermined known gas.

A vacuum valve for driving a valve body arranged facing a valve opening up and down relative to the valve opening to perform valve opening/closing operation, comprises: a first up-down driver configured to drive the valve body up and down with a first minimum drivable amount; and a second up-down driver configured to drive the valve body up and down with a second minimum drivable amount smaller than the first minimum drivable amount.

A programmable, electronically controlled sprinkler system has a hermetically sealed internal chamber which encloses all of the internal water flow, valves, mechanical and rotational components and a plurality of magnetic coupling arrangements which allow external motors to control operation of the internal mechanical components without requiring any hydraulic seals.